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Numbers whose base-9 representation has the same nonzero number of 1's and 7's.
0

%I #13 Jun 30 2021 01:53:47

%S 16,64,88,106,115,124,133,142,144,146,147,148,149,150,152,160,178,226,

%T 259,307,340,388,421,469,502,550,568,576,578,579,580,581,582,584,586,

%U 595,604,613,622,640,664,712,736,754,763,772,781,790,792,794,795,796

%N Numbers whose base-9 representation has the same nonzero number of 1's and 7's.

%t Select[Range[800],DigitCount[#,9,1]==DigitCount[#,9,7]>0&] (* _Harvey P. Dale_, Jan 30 2021 *)

%Y Cf. A007095.

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_